package com.hunttown.mes.common.utils;

import java.util.Date;

/**
 * 判断即将到来的时间
 * created by wangjunfu on 2020-06-06
 */
public class RelativeAfterDateUtils {

    private static final long ONE_MINUTE = 60000L;
    private static final long ONE_HOUR = 3600000L;
    private static final long ONE_DAY = 86400000L;
    private static final long ONE_WEEK = 604800000L;

    private static final String ONE_ZERO_AGO = "已到期";
    private static final String ONE_SECOND_AGO = "秒";
    private static final String ONE_MINUTE_AGO = "分钟";
    private static final String ONE_HOUR_AGO = "小时";
    private static final String ONE_DAY_AGO = "天";
    private static final String ONE_MONTH_AGO = "月";
    private static final String ONE_YEAR_AGO = "年";

    public static String format(Date date) {

        long delta = date.getTime() - new Date().getTime();

        if (delta < ONE_MINUTE) {
            long seconds = toSeconds(delta);

            if (seconds <= 0) {
                return ONE_ZERO_AGO;
            } else {
                return seconds + ONE_SECOND_AGO;
            }
        }

        if (delta < 45L * ONE_MINUTE) {
            long minutes = toMinutes(delta);
            return (minutes <= 0 ? 1 : minutes) + ONE_MINUTE_AGO;
        }

        if (delta < 24L * ONE_HOUR) {
            long hours = toHours(delta);
            return (hours <= 0 ? 1 : hours) + ONE_HOUR_AGO;
        }

        if (delta < 48L * ONE_HOUR) {
            return "1天";
        }

        if (delta < 30L * ONE_DAY) {
            long days = toDays(delta);
            return (days <= 0 ? 1 : days) + ONE_DAY_AGO;
        }

        if (delta < 12L * 4L * ONE_WEEK) {
            long months = toMonths(delta);
            return (months <= 0 ? 1 : months) + ONE_MONTH_AGO;
        } else {
            long years = toYears(delta);
            return (years <= 0 ? 1 : years) + ONE_YEAR_AGO;
        }

    }

    private static long toSeconds(long date) {
        return date / 1000L;
    }

    private static long toMinutes(long date) {
        return toSeconds(date) / 60L;
    }

    private static long toHours(long date) {
        return toMinutes(date) / 60L;
    }

    private static long toDays(long date) {
        return toHours(date) / 24L;
    }

    private static long toMonths(long date) {
        return toDays(date) / 30L;
    }

    private static long toYears(long date) {
        return toMonths(date) / 365L;
    }

}
